Water and oil repellents

ABSTRACT

CERTAIN FLUOROSILAZANES AND CHLOROSILANES ARE DISCLOSED. THE NEW COMPOUNDS ARE OF THE FORMULAS   RF-(CH2-CH2)X-SI(-R1)(-R2)-CL AND   NH(-SI(-R1)(-R2)-(CH2-CH2)X-RF)2   IN WHICH X IS 0-10 AND R1 AND R2 ARE INDEPENDENTLY SELECTED ALKYL GROUPS. THEY ARE USEFUL AS OIL AND WATER REPELLENTS AND AS DERIVATIZING AGENTS TO FACILITATE GAS-LIQUID CHROMATOGRAPHIC ANALYSES.

3,579,557 WATER AND OIL REPELLENTS Thomas W. Brooks and Paul D. Schuman, Gainesville, and Calvin D. Padgett, Waldo, Fla., assignors to Calgon Corporation, Pittsburgh, Pa. No Drawing. Filed Aug. 21, 1968, Ser. No. 754,457 Int. Cl. C07f 7/10 US. Cl. 260448.2N 3 Claims ABSTRACT OF THE DISCLOSURE Certain fiuorosilazanes and chlorosilanes are disclosed. The new compounds are of the formulas in which x is -10 and R and R are independently selected alkyl groups. They are useful as oil and water repellents and as derivatizing agents to facilitate gas-liquid chromatographic analyses.

Reference is made to US. Pat. 3,322,490, which contains an excellent review of the prior art in the field of water, oil, and soil repelling and shedding compositions, to which this invention pertains.

BACKGROUND OF THE INVENTION The field of oil and water repellents has grown considerably in the past few years, as demand has been created for materials, particularly textile materials, which resist not only water but stains and dirt of all kinds. It is difiicult to make such materials which exhibit both water and oil repellency, and at the same time are sub stantive to the textile or other surface to which they are added.

SUMMARY OF THE INVENTION We have invented a series of compounds which exhibit, when applied to a suitable substrate, the desired properties of oil and water repellency. They are compounds of the formula wherein R, is a radical of the formula CnF CnF CH (CF CFO, (CF CF(CF CH O (CF )CHO, or CnF O, R and R are radicals selected from the group consisting of aryl and lower alkyl groups having up to four carbon atoms, n is a whole numher from 1 to 18, x is a whole number from 1 to 10, and y is a whole number from 2 to 18.

Our new compounds are also useful as derivatizing agents in preparing samples for analysis by gas-liquid chromatography. The chloride form particularly will readily react with alcohols, amines and organic acids, thereby rendering them responsive to analytical techniques utiliz ing electron capture, and imparting characteristics of volatility which the sample may not otherwise have. They may also be used to convert SiOH groups on the surfaces of diatomaceous earth supports in gas chromatographs to groups which are inert to the compound to be analyzed, thus eliminating tailing commonly noticed in the analysis of many compounds.

United States Patent 0 Patented May 18, 1971 "ice Our preferred compounds are CFa CH3 2 and The synthesis of such compounds may be illustrated by the following sequence of reactions:

The following examples may seive further to illustrate the procedure for making our new compounds:

EXAMPLE I Synthesis of (CE; CFO CH Si (CH C1 To a 5-liter, 3-neck flask fitted with a Dry-Ice cooled condenser, a mechanical stirrer, a dropping funnel, and a gas inlet tube was added 287 g. (4.95 moles) of anhydrous KF and 1900 ml. of dry dimethyl formamide (DMF). The reaction mixture was cooled to 20 and while stirring hexafluoroacetone was added at a rate such that a continuous reflux occurred. After addition of 840 g. (5.06 moles) of hexafluoroacetone the reaction mixture was warmed to room temperature. The low temperature reflux condenser was replaced by a Water cooled Friedricks condenser which was connected to a trap maintained at 183. While stirring the reaction mixture at room temperature, 560 g. (4.63 moles) of allyl bromide was added. The mixture was heated at for 16 hours, then rectified on a 15 theoretical plate. Oldershaw distillation column, giving 771 g. (74% yield) of To an evacuated 2000-ml. capacity steel cylinder equipped with pressure gage and containing 2.3 g. of Pt on carbon and 2.0 g. of H PtCl .6H O was added 686 g. (2.95 moles) of (CF CFOCH CH=CH and 331 g. (3.52 moles) of (CH SiHCl. Shortly after addition of the reactants an exotherm occurred and the cylinder pressure rose to 120 p'.s.i.g. When allowed to cool to room temperature, the pressure remained at 40 p.s.i.g. The volatiles were vented and the remaining liquid distilled giving 524 g. (56% yield) of (CF CFO (CH Si(CH C1 B.P. 80-87 (43-46 mm.) Chromatographic analysis indicated +percent purity.

To a liter, 3-neck flask equipped with a thermowell, a stirrer, a gas inlet tube, and a gas outlet tube connected to a bubble counter was added 330 g. of hexane and 249 g. (0.778 mole) of (CF CFO(CH Si(CH )Cl. Arnmonia gas was added to the reaction mixture at rate adjusted to not exceed the reaction rate. This rate was monitored by observing the exit bubble counter. When no further reaction occurred, the reaction was terminated. The temperature of the reaction mixture rose from ambient to 4050 during the course of the reaction. The mixture was filtered and the filtrate distilled on 160 cm. column packed with glass helices giving 163 g. (72% yield) of [(CF CFO(CH Si(CH NH; B.P. 165-l68 (44 mm.).

EXAMPLE III Synthesis Of C7F15CH2O 3Sl (CH3 To a 1-liter, 3-neck flask fitted with a Vigreux distillation column vented to a trap cooled to -183, a thermometer, and an addition tunnel was added 300 m1. of dioxane and 56.0 g. (1.04 moles) of CH ONa. The reaction mixture was heated to about 90 and 200 g. (0.5 mole) of C F CH OH was slowly added while continuously removing CH H as distillate. After addition of the octanol, distillate was removed up to a distillate temperature of 100.

While at total reflux a solution of 121 g. (1.06 moles) of CH =CHCHC1 in 150 ml. of dioxane was added dropwise. After complete addition, the reaction mixture was cooled and a clear layer was removed by decantation. The residual salt was dissolved in H 0 and the organic layer which separated was combined with the decanted product. Distillation gave 137 g. (62% yield) of C iF OH 0CH OH=CH B.P. 175-177". Chromatographic analysis showed no impurities.

To a 250-ml., 3-neck flask fitted with a thermometer, a 78 condenser vented to a -l83 trap, a stirrer and an addition funnel was added 56.0 g. (0.127 mole) of C F CH OCH CH=CH 0.5 g. of 5% Pt on carbon and 0.5 g. of H PtCl .6H 0. With the reaction mixture at room temperature, 20.8 g. (0.22 mole) of (CH SiI-ICl was added at a rate sufiicient to maintain the temperature of reaction mixture at 40 to 50. On distillation of the resultant reaction mixture, 45.7 g. (70% yield) of C F CH O (CH Si(CH C1 B.P. 127-128 l 2 mm., was obtained.

EXAMPLE IV Synthesis of [C7F15CH20(CH2)3Si (CH ]NH This synthesis is similar to that described in Example II, using the chloride product obtained in Example III.

4 An 0f B.P. 175177/1.5 mm., was obtained.

EXAMPLE V Synthesis of C F (CH Si(CH Cl To an evacuated 900-ml. capacity steel cylinder was added 98 g. (0.50 mole) of C F CH:CH 67.8 g. (0.72 mole) of (CH SiHCl, 1.0 g. 5% Pt on carbon and 1.7 g. of H PtCl .6H O. After heating the reaction for 22 hours at the liquid product was transferred to a glass flask and distilled to give 93.6 g. (64% yield) of C F (CH Si(CH Cl, B.P. 6367/41 mm.

EXAMPLE VI Synthesis Of [C3F7 Si CH3 2] ZNH This synthesis is similar to that described in Example II, utilizing the chloride of Example V. A 93% yield of [C F (CH Si(CH NI-I, B.P. 123125/41 mm., was obtained.

We do not intend to be restricted to the above specific illustrations and examples. Our invention may otherwise be practiced within the scope of the following claims:

We claim:

1. Compound of the formula wherein R, is a monovalent radical selected from the group consisting of CnF CnF CH O,

( CF CFO, (CP CHO, (C1 CF CF CH O and CnF O, R and R are selected from aryl groups and alkyl groups of up to four carbon atoms, n is a whole number from 1 to 18, x is a whole number from 1 to 10, y is a whole number from 2 to 18.

2. Compound of the formula TOBIAS E. LJEVOW, Primary Examiner P. F. SHAV'ER, Assistant Examiner US. Cl. X.R.

260-448.2B, 448.2R; l0613R UNITED STATES PATENT OFFICE CERTIFICATEv OF CORRECTION Patent No. 3,579,557 Dated May 18, 1971 Inventor) Thomas W. Brooks et a1 It is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:

Column 1, formula 1, portion of the formula reading SiCl should read -Si-Cl formula II, portion of the formula reading Si? should read Sig-NH Column 3, line 4, before "liter" insert 1- line 47, after "of" insert th Signed and sealed this 23rd day of May 1972.

(SEAL) Attest:

EDWARD M.FLETCHER,JR. ROBERT GOTTSCHALK Attesting Officer Commissioner of Patents 1 FORM PO-105O (0-69) USCOMM-DC scan-Pea i 0.5 GOVIINIINT PI IITI'IGG OFFICE "I. 0-Jll-3M 

